Closed-Form Design of Maxflat Fractional Delay IIR Filters
نویسنده
چکیده
Fractional delay (FD) filters are an important class of digital filters and are useful in various signal processing applications. In this paper, the design problem of the maxflat FD IIR filters is discussed, and a new closed-form expression for its filter coefficients is presented. The filter coefficients are directly derived by solving a linear system of Vandermonde equations, which are obtained from the flatness conditions of FD filters. The existing maxflat FD FIR and allpass IIR filters are two special cases of the proposed maxflat FD IIR filters. Finally, some examples are designed to demonstrate the effectiveness of the proposed maxflat FD IIR filters.
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